Embedded controller return minimum and maximum frequencies, unfortunately
we have no way to know the step for all available frequencies.
Even if not complete, we can return a list of known values using the
standard read_avail callback (IIO_CHAN_INFO_SAMP_FREQ) to provide them to
userland.
Now cros_ec_* sensors provides frequencies values in sysfs like this:
"0 min max". 0 is always true to disable the sensor.
Default frequencies are provided for earlier protocol.
Signed-off-by: Nick Vaccaro <[email protected]>
Signed-off-by: Fabien Lahoudere <[email protected]>
---
.../common/cros_ec_sensors/cros_ec_sensors.c | 3 +
.../cros_ec_sensors/cros_ec_sensors_core.c | 65 +++++++++++++++++++
drivers/iio/light/cros_ec_light_prox.c | 3 +
.../linux/iio/common/cros_ec_sensors_core.h | 21 ++++++
4 files changed, 92 insertions(+)
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
index 17af4e0fd5f8..2f1b6d8d617b 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
@@ -175,6 +175,7 @@ static int cros_ec_sensors_write(struct iio_dev *indio_dev,
static const struct iio_info ec_sensors_info = {
.read_raw = &cros_ec_sensors_read,
.write_raw = &cros_ec_sensors_write,
+ .read_avail = &cros_ec_sensors_core_read_avail,
};
static int cros_ec_sensors_probe(struct platform_device *pdev)
@@ -211,6 +212,8 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_FREQUENCY) |
BIT(IIO_CHAN_INFO_SAMP_FREQ);
+ channel->info_mask_shared_by_all_available =
+ BIT(IIO_CHAN_INFO_SAMP_FREQ);
channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
channel->scan_index = i;
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
index 81111af8a167..805652250960 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
@@ -50,6 +50,37 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
return ret;
}
+static void get_default_min_max_freq(enum motionsensor_type type,
+ u32 *min_freq,
+ u32 *max_freq)
+{
+ switch (type) {
+ case MOTIONSENSE_TYPE_ACCEL:
+ case MOTIONSENSE_TYPE_GYRO:
+ *min_freq = 12500;
+ *max_freq = 100000;
+ break;
+ case MOTIONSENSE_TYPE_MAG:
+ *min_freq = 5000;
+ *max_freq = 25000;
+ break;
+ case MOTIONSENSE_TYPE_PROX:
+ case MOTIONSENSE_TYPE_LIGHT:
+ *min_freq = 100;
+ *max_freq = 50000;
+ break;
+ case MOTIONSENSE_TYPE_BARO:
+ *min_freq = 250;
+ *max_freq = 20000;
+ break;
+ case MOTIONSENSE_TYPE_ACTIVITY:
+ default:
+ *min_freq = 0;
+ *max_freq = 0;
+ break;
+ }
+}
+
int cros_ec_sensors_core_init(struct platform_device *pdev,
struct iio_dev *indio_dev,
bool physical_device)
@@ -100,6 +131,19 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
}
state->type = state->resp->info.type;
state->loc = state->resp->info.location;
+
+ /* 0 is a correct value used to stop the device */
+ state->frequencies[0] = 0;
+ if (state->msg->version < 3) {
+ get_default_min_max_freq(state->resp->info.type,
+ &state->frequencies[1],
+ &state->frequencies[2]);
+ } else {
+ state->frequencies[1] =
+ state->resp->info_3.min_frequency;
+ state->frequencies[2] =
+ state->resp->info_3.max_frequency;
+ }
}
return 0;
@@ -461,6 +505,27 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
}
EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
+int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals,
+ int *type,
+ int *length,
+ long mask)
+{
+ struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *length = ARRAY_SIZE(state->frequencies);
+ *vals = (const int *)&state->frequencies;
+ *type = IIO_VAL_INT;
+ return IIO_AVAIL_LIST;
+ }
+
+ return -EINVAL;
+}
+EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail);
+
int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
index 308ee6ff2e22..c62cb022b6bc 100644
--- a/drivers/iio/light/cros_ec_light_prox.c
+++ b/drivers/iio/light/cros_ec_light_prox.c
@@ -164,6 +164,7 @@ static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
static const struct iio_info cros_ec_light_prox_info = {
.read_raw = &cros_ec_light_prox_read,
.write_raw = &cros_ec_light_prox_write,
+ .read_avail = &cros_ec_sensors_core_read_avail,
};
static int cros_ec_light_prox_probe(struct platform_device *pdev)
@@ -198,6 +199,8 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
channel->info_mask_shared_by_all =
BIT(IIO_CHAN_INFO_SAMP_FREQ) |
BIT(IIO_CHAN_INFO_FREQUENCY);
+ channel->info_mask_shared_by_all_available =
+ BIT(IIO_CHAN_INFO_SAMP_FREQ);
channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
channel->scan_type.shift = 0;
diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 0c636b9fe8d7..a9623111f7c9 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -70,6 +70,9 @@ struct cros_ec_sensors_core_state {
unsigned long scan_mask, s16 *data);
int curr_sampl_freq;
+
+ /* Table of known available frequencies : 0, Min and Max in mHz */
+ int frequencies[3];
};
/**
@@ -150,6 +153,24 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask);
+/**
+ * cros_ec_sensors_core_read_avail() - get available values
+ * @indio_dev: pointer to state information for device
+ * @chan: channel specification structure table
+ * @vals: list of available values
+ * @type: type of data returned
+ * @length: number of data returned in the array
+ * @mask: specifies which values to be requested
+ *
+ * Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST
+ */
+int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals,
+ int *type,
+ int *length,
+ long mask);
+
/**
* cros_ec_sensors_core_write() - function to write a value to the sensor
* @st: pointer to state information for device
--
2.19.2
On Tue, 9 Jul 2019 13:53:45 +0200
Fabien Lahoudere <[email protected]> wrote:
> Embedded controller return minimum and maximum frequencies, unfortunately
> we have no way to know the step for all available frequencies.
> Even if not complete, we can return a list of known values using the
> standard read_avail callback (IIO_CHAN_INFO_SAMP_FREQ) to provide them to
> userland.
>
> Now cros_ec_* sensors provides frequencies values in sysfs like this:
> "0 min max". 0 is always true to disable the sensor.
>
> Default frequencies are provided for earlier protocol.
>
> Signed-off-by: Nick Vaccaro <[email protected]>
> Signed-off-by: Fabien Lahoudere <[email protected]>
There is some trailing whitespace in here, and with the high level
of other work going on in this driver a lot of fuzz.
So with the whitespace fixed,
Acked-by: Jonathan Cameron <[email protected]>
> ---
> .../common/cros_ec_sensors/cros_ec_sensors.c | 3 +
> .../cros_ec_sensors/cros_ec_sensors_core.c | 65 +++++++++++++++++++
> drivers/iio/light/cros_ec_light_prox.c | 3 +
> .../linux/iio/common/cros_ec_sensors_core.h | 21 ++++++
> 4 files changed, 92 insertions(+)
>
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> index 17af4e0fd5f8..2f1b6d8d617b 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> @@ -175,6 +175,7 @@ static int cros_ec_sensors_write(struct iio_dev *indio_dev,
> static const struct iio_info ec_sensors_info = {
> .read_raw = &cros_ec_sensors_read,
> .write_raw = &cros_ec_sensors_write,
> + .read_avail = &cros_ec_sensors_core_read_avail,
> };
>
> static int cros_ec_sensors_probe(struct platform_device *pdev)
> @@ -211,6 +212,8 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
> BIT(IIO_CHAN_INFO_SCALE) |
> BIT(IIO_CHAN_INFO_FREQUENCY) |
> BIT(IIO_CHAN_INFO_SAMP_FREQ);
> + channel->info_mask_shared_by_all_available =
> + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> channel->scan_index = i;
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index 81111af8a167..805652250960 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -50,6 +50,37 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
> return ret;
> }
>
> +static void get_default_min_max_freq(enum motionsensor_type type,
> + u32 *min_freq,
> + u32 *max_freq)
> +{
> + switch (type) {
> + case MOTIONSENSE_TYPE_ACCEL:
> + case MOTIONSENSE_TYPE_GYRO:
> + *min_freq = 12500;
> + *max_freq = 100000;
> + break;
> + case MOTIONSENSE_TYPE_MAG:
> + *min_freq = 5000;
> + *max_freq = 25000;
> + break;
> + case MOTIONSENSE_TYPE_PROX:
> + case MOTIONSENSE_TYPE_LIGHT:
> + *min_freq = 100;
> + *max_freq = 50000;
> + break;
> + case MOTIONSENSE_TYPE_BARO:
> + *min_freq = 250;
> + *max_freq = 20000;
> + break;
> + case MOTIONSENSE_TYPE_ACTIVITY:
> + default:
> + *min_freq = 0;
> + *max_freq = 0;
> + break;
> + }
> +}
> +
> int cros_ec_sensors_core_init(struct platform_device *pdev,
> struct iio_dev *indio_dev,
> bool physical_device)
> @@ -100,6 +131,19 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
> }
> state->type = state->resp->info.type;
> state->loc = state->resp->info.location;
> +
> + /* 0 is a correct value used to stop the device */
> + state->frequencies[0] = 0;
> + if (state->msg->version < 3) {
> + get_default_min_max_freq(state->resp->info.type,
> + &state->frequencies[1],
> + &state->frequencies[2]);
> + } else {
> + state->frequencies[1] =
> + state->resp->info_3.min_frequency;
> + state->frequencies[2] =
> + state->resp->info_3.max_frequency;
> + }
> }
>
> return 0;
> @@ -461,6 +505,27 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
> }
> EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
>
> +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + const int **vals,
> + int *type,
> + int *length,
> + long mask)
> +{
> + struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_SAMP_FREQ:
> + *length = ARRAY_SIZE(state->frequencies);
> + *vals = (const int *)&state->frequencies;
> + *type = IIO_VAL_INT;
> + return IIO_AVAIL_LIST;
> + }
> +
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail);
> +
> int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state *st,
> struct iio_chan_spec const *chan,
> int val, int val2, long mask)
> diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
> index 308ee6ff2e22..c62cb022b6bc 100644
> --- a/drivers/iio/light/cros_ec_light_prox.c
> +++ b/drivers/iio/light/cros_ec_light_prox.c
> @@ -164,6 +164,7 @@ static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
> static const struct iio_info cros_ec_light_prox_info = {
> .read_raw = &cros_ec_light_prox_read,
> .write_raw = &cros_ec_light_prox_write,
> + .read_avail = &cros_ec_sensors_core_read_avail,
> };
>
> static int cros_ec_light_prox_probe(struct platform_device *pdev)
> @@ -198,6 +199,8 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
> channel->info_mask_shared_by_all =
> BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> BIT(IIO_CHAN_INFO_FREQUENCY);
> + channel->info_mask_shared_by_all_available =
> + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> channel->scan_type.shift = 0;
> diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
> index 0c636b9fe8d7..a9623111f7c9 100644
> --- a/include/linux/iio/common/cros_ec_sensors_core.h
> +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> @@ -70,6 +70,9 @@ struct cros_ec_sensors_core_state {
> unsigned long scan_mask, s16 *data);
>
> int curr_sampl_freq;
> +
> + /* Table of known available frequencies : 0, Min and Max in mHz */
> + int frequencies[3];
> };
>
> /**
> @@ -150,6 +153,24 @@ int cros_ec_sensors_core_read(struct cros_ec_sensors_core_state *st,
> struct iio_chan_spec const *chan,
> int *val, int *val2, long mask);
>
> +/**
> + * cros_ec_sensors_core_read_avail() - get available values
> + * @indio_dev: pointer to state information for device
> + * @chan: channel specification structure table
> + * @vals: list of available values
> + * @type: type of data returned
> + * @length: number of data returned in the array
> + * @mask: specifies which values to be requested
> + *
> + * Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST
> + */
> +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + const int **vals,
> + int *type,
> + int *length,
> + long mask);
> +
> /**
> * cros_ec_sensors_core_write() - function to write a value to the sensor
> * @st: pointer to state information for device
Le dimanche 14 juillet 2019 à 18:31 +0100, Jonathan Cameron a écrit :
> On Tue, 9 Jul 2019 13:53:45 +0200
> Fabien Lahoudere <[email protected]> wrote:
>
> > Embedded controller return minimum and maximum frequencies,
> > unfortunately
> > we have no way to know the step for all available frequencies.
> > Even if not complete, we can return a list of known values using
> > the
> > standard read_avail callback (IIO_CHAN_INFO_SAMP_FREQ) to provide
> > them to
> > userland.
> >
> > Now cros_ec_* sensors provides frequencies values in sysfs like
> > this:
> > "0 min max". 0 is always true to disable the sensor.
> >
> > Default frequencies are provided for earlier protocol.
> >
> > Signed-off-by: Nick Vaccaro <[email protected]>
> > Signed-off-by: Fabien Lahoudere <[email protected]>
> There is some trailing whitespace in here, and with the high level
> of other work going on in this driver a lot of fuzz.
>
Sorry for that, I will fix it quickly.
Thanks for reviewing
> So with the whitespace fixed,
> Acked-by: Jonathan Cameron <[email protected]>
> > ---
> > .../common/cros_ec_sensors/cros_ec_sensors.c | 3 +
> > .../cros_ec_sensors/cros_ec_sensors_core.c | 65
> > +++++++++++++++++++
> > drivers/iio/light/cros_ec_light_prox.c | 3 +
> > .../linux/iio/common/cros_ec_sensors_core.h | 21 ++++++
> > 4 files changed, 92 insertions(+)
> >
> > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > index 17af4e0fd5f8..2f1b6d8d617b 100644
> > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > @@ -175,6 +175,7 @@ static int cros_ec_sensors_write(struct iio_dev
> > *indio_dev,
> > static const struct iio_info ec_sensors_info = {
> > .read_raw = &cros_ec_sensors_read,
> > .write_raw = &cros_ec_sensors_write,
> > + .read_avail = &cros_ec_sensors_core_read_avail,
> > };
> >
> > static int cros_ec_sensors_probe(struct platform_device *pdev)
> > @@ -211,6 +212,8 @@ static int cros_ec_sensors_probe(struct
> > platform_device *pdev)
> > BIT(IIO_CHAN_INFO_SCALE) |
> > BIT(IIO_CHAN_INFO_FREQUENCY) |
> > BIT(IIO_CHAN_INFO_SAMP_FREQ);
> > + channel->info_mask_shared_by_all_available =
> > + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> > channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> > channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> > channel->scan_index = i;
> > diff --git
> > a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > index 81111af8a167..805652250960 100644
> > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > @@ -50,6 +50,37 @@ static int
> > cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
> > return ret;
> > }
> >
> > +static void get_default_min_max_freq(enum motionsensor_type type,
> > + u32 *min_freq,
> > + u32 *max_freq)
> > +{
> > + switch (type) {
> > + case MOTIONSENSE_TYPE_ACCEL:
> > + case MOTIONSENSE_TYPE_GYRO:
> > + *min_freq = 12500;
> > + *max_freq = 100000;
> > + break;
> > + case MOTIONSENSE_TYPE_MAG:
> > + *min_freq = 5000;
> > + *max_freq = 25000;
> > + break;
> > + case MOTIONSENSE_TYPE_PROX:
> > + case MOTIONSENSE_TYPE_LIGHT:
> > + *min_freq = 100;
> > + *max_freq = 50000;
> > + break;
> > + case MOTIONSENSE_TYPE_BARO:
> > + *min_freq = 250;
> > + *max_freq = 20000;
> > + break;
> > + case MOTIONSENSE_TYPE_ACTIVITY:
> > + default:
> > + *min_freq = 0;
> > + *max_freq = 0;
> > + break;
> > + }
> > +}
> > +
> > int cros_ec_sensors_core_init(struct platform_device *pdev,
> > struct iio_dev *indio_dev,
> > bool physical_device)
> > @@ -100,6 +131,19 @@ int cros_ec_sensors_core_init(struct
> > platform_device *pdev,
> > }
> > state->type = state->resp->info.type;
> > state->loc = state->resp->info.location;
> > +
> > + /* 0 is a correct value used to stop the device */
> > + state->frequencies[0] = 0;
> > + if (state->msg->version < 3) {
> > + get_default_min_max_freq(state->resp-
> > >info.type,
> > + &state-
> > >frequencies[1],
> > + &state-
> > >frequencies[2]);
> > + } else {
> > + state->frequencies[1] =
> > + state->resp->info_3.min_frequency;
> > + state->frequencies[2] =
> > + state->resp->info_3.max_frequency;
> > + }
> > }
> >
> > return 0;
> > @@ -461,6 +505,27 @@ int cros_ec_sensors_core_read(struct
> > cros_ec_sensors_core_state *st,
> > }
> > EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
> >
> > +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> > + struct iio_chan_spec const *chan,
> > + const int **vals,
> > + int *type,
> > + int *length,
> > + long mask)
> > +{
> > + struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> > +
> > + switch (mask) {
> > + case IIO_CHAN_INFO_SAMP_FREQ:
> > + *length = ARRAY_SIZE(state->frequencies);
> > + *vals = (const int *)&state->frequencies;
> > + *type = IIO_VAL_INT;
> > + return IIO_AVAIL_LIST;
> > + }
> > +
> > + return -EINVAL;
> > +}
> > +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail);
> > +
> > int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state
> > *st,
> > struct iio_chan_spec const *chan,
> > int val, int val2, long mask)
> > diff --git a/drivers/iio/light/cros_ec_light_prox.c
> > b/drivers/iio/light/cros_ec_light_prox.c
> > index 308ee6ff2e22..c62cb022b6bc 100644
> > --- a/drivers/iio/light/cros_ec_light_prox.c
> > +++ b/drivers/iio/light/cros_ec_light_prox.c
> > @@ -164,6 +164,7 @@ static int cros_ec_light_prox_write(struct
> > iio_dev *indio_dev,
> > static const struct iio_info cros_ec_light_prox_info = {
> > .read_raw = &cros_ec_light_prox_read,
> > .write_raw = &cros_ec_light_prox_write,
> > + .read_avail = &cros_ec_sensors_core_read_avail,
> > };
> >
> > static int cros_ec_light_prox_probe(struct platform_device *pdev)
> > @@ -198,6 +199,8 @@ static int cros_ec_light_prox_probe(struct
> > platform_device *pdev)
> > channel->info_mask_shared_by_all =
> > BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> > BIT(IIO_CHAN_INFO_FREQUENCY);
> > + channel->info_mask_shared_by_all_available =
> > + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> > channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> > channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> > channel->scan_type.shift = 0;
> > diff --git a/include/linux/iio/common/cros_ec_sensors_core.h
> > b/include/linux/iio/common/cros_ec_sensors_core.h
> > index 0c636b9fe8d7..a9623111f7c9 100644
> > --- a/include/linux/iio/common/cros_ec_sensors_core.h
> > +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> > @@ -70,6 +70,9 @@ struct cros_ec_sensors_core_state {
> > unsigned long scan_mask, s16
> > *data);
> >
> > int curr_sampl_freq;
> > +
> > + /* Table of known available frequencies : 0, Min and Max in mHz
> > */
> > + int frequencies[3];
> > };
> >
> > /**
> > @@ -150,6 +153,24 @@ int cros_ec_sensors_core_read(struct
> > cros_ec_sensors_core_state *st,
> > struct iio_chan_spec const *chan,
> > int *val, int *val2, long mask);
> >
> > +/**
> > + * cros_ec_sensors_core_read_avail() - get available values
> > + * @indio_dev: pointer to state information for device
> > + * @chan: channel specification structure table
> > + * @vals: list of available values
> > + * @type: type of data returned
> > + * @length: number of data returned in the array
> > + * @mask: specifies which values to be requested
> > + *
> > + * Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST
> > + */
> > +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> > + struct iio_chan_spec const *chan,
> > + const int **vals,
> > + int *type,
> > + int *length,
> > + long mask);
> > +
> > /**
> > * cros_ec_sensors_core_write() - function to write a value to the
> > sensor
> > * @st: pointer to state information for device